caa a22 4500 388061014 CHVBK 20180307125120.0 cr unu---uuuuu 161130e199810 xx s 000 0 eng 10.1017/S1357729800009954 doi S1357729800009954 pii (NATIONALLICENCE)cambridge-10.1017/S1357729800009954 The effects of including white clover in perennial ryegrass swards and the height of mixed swards on the milk production, sward selection and ingestive behaviour of dairy cows [Elektronische Daten] Two experiments were conducted with dairy cows to examine the effects of including white clover in perennial ryegrass swards and of offering the cows a choice between tall and short mixed perennial ryegrass/white clover swards. In the first experiment, cows grazed a perennial ryegrass sward (treatment Prg); a mixed sward of perennial ryegrass and white clover (treatment WC); treatment Prg during the night and treatment WC during the day (treatment Prg night/WC day); or they were offered a choice between Prg and WC (treatment Prg/WC). Cows in treatment WC produced more milk than cows in treatment Prg, with cows in Prg night/WC day and Prg/WC intermediate. The milk fat content of cows in treatment Prg was greater than in the other three treatments. When cows were offered both mixed grass/clover and pure grass swards (treatments Prg night/WC day and Prg/WC) they exhibited a partial preference for the WC sward and grazed it to a lower herbage height than the pure grass sward. In the second experiment, cows were offered a WC sward at 6 or 3·5 cm sward surface height, or a choice between pastures at the two heights. Cows offered only the tall sward produced most milk, and those offered only the short sward produced the least. Milk fat content was reduced for cows offered only the tall sward. Cows offered a choice of the tall or short swards spent longer grazing in total than the cows offered only tall or only short swards but there was no difference in the time spent grazing the tall and short swards. Copyright © British Society of Animal Science 1998 dairy cows nationallicence herbage nationallicence milk composition nationallicence selective grazing nationallicence Trifolium repens nationallicence Phillips C. J. C. School of Agricultural and Forest Sciences, University of Wales, Bangor LL57 2UW James N. L. School of Agricultural and Forest Sciences, University of Wales, Bangor LL57 2UW Animal Science Cambridge University Press 67/2(1998-10), 195-202 1357-7298 67:2<195 1998 67 ASC https://doi.org/10.1017/S1357729800009954 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S1357729800009954 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Phillips C. J. C. School of Agricultural and Forest Sciences, University of Wales, Bangor LL57 2UW NATIONALLICENCE 700 1- James N. L. School of Agricultural and Forest Sciences, University of Wales, Bangor LL57 2UW NATIONALLICENCE 773 0- Animal Science Cambridge University Press 67/2(1998-10), 195-202 1357-7298 67:2<195 1998 67 ASC CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge